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The wireless standards scene and its evolution strengthens the need for functional flexibility in future radios. Multimode terminals supporting an increasingly large variety of standards (cellular, WLANs, WMANs, WPANs) are subject to a cost increase that is addressed by more flexible radio interfaces. Energy efficiency, however, is the main obstacle to successfully deploying such reconfigurable radios. To address this, it is essential to design energy-scalable SDRs, both for the radio front-end and the digital baseband platform. Complementing this, an essential ingredient is an intelligent controller that optimally exploits this scalability and the run-time dynamics to translate potential energy scalability to actual low-power operation. To realize this goal, an energy-aware cross-layer radio management framework is introduced. It was instantiated in different case studies, showing the applicability of this approach in realistic …